This study was conducted in the field of domestic birds / Department of Animal Production / College of Agriculture - Al-Qasim Green University for a period of 6 weeks from 1/11/2021 - 15/12/2021, preceded by two weeks to train roosters to collect semen, to study the effect of adding the aqueous extract to lemongrass leaves in different levels on the reproductive characteristics of males of meat broiler mothers (Ros 308) at the age (50) weeks and by 16 roosters, the roosters were randomly divided into 4 treatments with 4 replications, each replicate included only one rooster. The treatments were as follows: The first treatment was the control group without adding, the second treatment was adding 200 ml of aqueous extract of lemongrass leaves/litre of water, the third treatment was adding 300 ml of aqueous extract of lemongrass leaves/litre of water, the fourth treatment was adding 400 ml of aqueous extract For lemongrass leaves/litre of water. The following results were: a significant improvement (P < 0.01) in the second and third treatments with concentrations of 200 and 300 ml in ejaculation volume, percentage of salt-resistant sperm, percentage of individual motility of the sperm and percentage of live sperms compared to the first and fourth treatments, and a significant decrease (P < 0.01) in the percentage of death sperms in the second, third and fourth treatment over the first treatment (control), while a ratio of mass motility, sperm concentration per ejaculate, and testis weight, the third treatment (P < 0.01) was superior to the rest of the treatments. the histological cutting of the testicle, it was noted an improvement in the sperm biosynthesis process and an increase in the number of sperms for the third and second treatments compared to the first (control) and the fourth treatments.